import {
  Controller,
  Get,
  Post,
  Put,
  Delete,
  Body,
  Param,
  Query,
  UploadedFile,
  UploadedFiles,
  UseInterceptors,
  UseGuards,
  HttpStatus,
  HttpException,
  HttpCode,
  ParseUUIDPipe,
  ParseFilePipe,
  MaxFileSizeValidator,
  FileTypeValidator,
  BadRequestException,
  Res,
  StreamableFile,
  ValidationPipe,
  UsePipes
} from '@nestjs/common'
import { FileInterceptor, FilesInterceptor } from '@nestjs/platform-express'
import { ApiTags, ApiOperation, ApiResponse, ApiConsumes, ApiQuery, ApiBearerAuth } from '@nestjs/swagger'
import { Throttle } from '@nestjs/throttler'
import { JwtAuthGuard } from '../auth/guards/jwt-auth.guard'
import { RolesGuard } from '../auth/guards/roles.guard'
import { Roles } from '../auth/decorators/roles.decorator'
import { ResponseTransformInterceptor } from '../../common/interceptors/response.interceptor'
import { LoggingInterceptor } from '../../common/interceptors/logging.interceptor'
import {
  FileUploadDto,
  FileDto,
  UpdateFileDto,
  QueryFileDto,
  BulkFileOperationDto,
  ImageProcessDto,
  FileStatsDto,
  FileShareDto,
  FileShareResponseDto,
  FolderDto,
  CreateFolderDto,
  UpdateFolderDto,
  FileUploadResponseDto,
  FileDownloadDto
} from '../../common/dto/file.dto'
import { ResponseDto, PaginationResponseDto } from '../../common/dto/base.dto'
import { UserRole } from '../../common/decorators/auth.decorator'
import { CurrentUser } from '../auth/decorators/current-user.decorator'
import type { Response } from 'express'

/**
 * 文件管理控制器
 * 负责文件上传、管理、处理等功能
 */
@ApiTags('文件管理')
@Controller('api/files')
@UseGuards(JwtAuthGuard, RolesGuard)
@UseInterceptors(ResponseTransformInterceptor, LoggingInterceptor)
@ApiBearerAuth()
export class FileController {
  constructor() {} // private readonly folderService: FolderService, // private readonly imageService: ImageService, // private readonly fileService: FileService,

  /**
   * 上传单个文件
   */
  @Post('upload')
  @ApiOperation({ summary: '上传单个文件' })
  @ApiConsumes('multipart/form-data')
  @ApiResponse({
    status: HttpStatus.CREATED,
    description: '文件上传成功',
    type: ResponseDto<FileUploadResponseDto>
  })
  @HttpCode(HttpStatus.CREATED)
  @UseInterceptors(FileInterceptor('file'))
  @Throttle({ default: { limit: 10, ttl: 60000 } }) // 每分钟最多上传10个文件
  async uploadFile(
    @UploadedFile(
      new ParseFilePipe({
        validators: [
          new MaxFileSizeValidator({ maxSize: 50 * 1024 * 1024 }), // 50MB
          new FileTypeValidator({
            fileType: /\.(jpg|jpeg|png|gif|webp|pdf|doc|docx|xls|xlsx|ppt|pptx|txt|zip|rar|mp4|avi|mov|mp3|wav)$/i
          })
        ]
      })
    )
    file: Express.Multer.File,
    @Body() uploadDto: FileUploadDto,
    @CurrentUser() user: any
  ): Promise<ResponseDto<FileUploadResponseDto>> {
    // const uploadedFile = await this.fileService.uploadFile(file, uploadDto, user.id);
    const uploadedFile: FileUploadResponseDto = {
      id: 'file-' + Date.now(),
      filename: uploadDto.filename || file.originalname,
      originalName: file.originalname,
      url: `/uploads/${file.originalname}`,
      thumbnailUrl: file.mimetype.startsWith('image/') ? `/uploads/thumbnails/${file.originalname}` : undefined,
      size: file.size,
      mimeType: file.mimetype,
      type: this.getFileType(file.mimetype),
      hash: 'sha256-hash-' + Date.now(),
      uploadedAt: new Date(),
      processingStatus: 'completed',
      metadata: {
        uploader: user.username,
        uploadIp: '192.168.1.1',
        userAgent: 'Mozilla/5.0...'
      }
    }

    return {
      code: HttpStatus.CREATED,
      message: '文件上传成功',
      data: uploadedFile
    }
  }

  /**
   * 批量上传文件
   */
  @Post('upload/batch')
  @ApiOperation({ summary: '批量上传文件' })
  @ApiConsumes('multipart/form-data')
  @ApiResponse({
    status: HttpStatus.CREATED,
    description: '文件批量上传成功',
    type: ResponseDto<FileUploadResponseDto[]>
  })
  @HttpCode(HttpStatus.CREATED)
  @UseInterceptors(FilesInterceptor('files', 10)) // 最多10个文件
  @Throttle({ default: { limit: 5, ttl: 60000 } }) // 每分钟最多5次批量上传
  async uploadFiles(
    @UploadedFiles(
      new ParseFilePipe({
        validators: [
          new MaxFileSizeValidator({ maxSize: 50 * 1024 * 1024 }) // 50MB per file
        ]
      })
    )
    files: Express.Multer.File[],
    @Body() uploadDto: FileUploadDto,
    @CurrentUser() user: any
  ): Promise<ResponseDto<FileUploadResponseDto[]>> {
    if (!files || files.length === 0) {
      throw new BadRequestException('至少需要上传一个文件')
    }

    // const uploadedFiles = await this.fileService.uploadFiles(files, uploadDto, user.id);
    const uploadedFiles: FileUploadResponseDto[] = files.map((file, index) => ({
      id: 'file-' + Date.now() + '-' + index,
      filename: `${uploadDto.filename || file.originalname}`,
      originalName: file.originalname,
      url: `/uploads/${file.originalname}`,
      thumbnailUrl: file.mimetype.startsWith('image/') ? `/uploads/thumbnails/${file.originalname}` : undefined,
      size: file.size,
      mimeType: file.mimetype,
      type: this.getFileType(file.mimetype),
      hash: 'sha256-hash-' + Date.now() + '-' + index,
      uploadedAt: new Date(),
      processingStatus: 'completed'
    }))

    return {
      code: HttpStatus.CREATED,
      message: `成功上传 ${files.length} 个文件`,
      data: uploadedFiles
    }
  }

  /**
   * 获取文件列表
   */
  @Get()
  @ApiOperation({ summary: '获取文件列表' })
  @ApiResponse({
    status: HttpStatus.OK,
    description: '文件列表获取成功',
    type: PaginationResponseDto<FileDto>
  })
  @ApiQuery({ name: 'type', required: false, description: '文件类型' })
  @ApiQuery({ name: 'status', required: false, description: '文件状态' })
  @ApiQuery({ name: 'category', required: false, description: '文件分类' })
  @ApiQuery({ name: 'search', required: false, description: '搜索关键词' })
  // @UseInterceptors(CacheInterceptor)
  // @CacheTTL(60) // 1分钟缓存
  async getFiles(@Query(ValidationPipe) query: QueryFileDto): Promise<PaginationResponseDto<FileDto>> {
    // const result = await this.fileService.getFiles(query);
    const files: FileDto[] = [
      {
        id: '1',
        filename: 'example.jpg',
        originalName: 'example.jpg',
        type: 'image' as any,
        mimeType: 'image/jpeg',
        size: 1024000,
        path: '/uploads/example.jpg',
        url: '/uploads/example.jpg',
        thumbnailUrl: '/uploads/thumbnails/example.jpg',
        status: 'completed' as any,
        access: 'public' as any,
        uploaderId: 'user-1',
        uploader: {
          id: 'user-1',
          username: 'testuser',
          nickname: '测试用户',
          avatar: '/avatars/user1.jpg'
        },
        hash: 'sha256-hash-1',
        downloadCount: 10,
        viewCount: 50,
        createdAt: new Date(),
        updatedAt: new Date()
      }
    ]

    return {
      data: files,
      total: 10,
      page: query.page || 1,
      limit: query.limit || 10,
      totalPages: 1,
      hasNext: false,
      hasPrev: false
    }
  }

  /**
   * 获取文件详情
   */
  @Get(':id')
  @ApiOperation({ summary: '获取文件详情' })
  @ApiResponse({
    status: HttpStatus.OK,
    description: '文件详情获取成功',
    type: ResponseDto<FileDto>
  })
  async getFile(@Param('id', ParseUUIDPipe) id: string): Promise<ResponseDto<FileDto>> {
    // const file = await this.fileService.getFileById(id);
    const file: FileDto = {
      id,
      filename: 'example.jpg',
      originalName: 'example.jpg',
      type: 'image' as any,
      mimeType: 'image/jpeg',
      size: 1024000,
      path: '/uploads/example.jpg',
      url: '/uploads/example.jpg',
      thumbnailUrl: '/uploads/thumbnails/example.jpg',
      status: 'completed' as any,
      access: 'public' as any,
      uploaderId: 'user-1',
      uploader: {
        id: 'user-1',
        username: 'testuser',
        nickname: '测试用户',
        avatar: '/avatars/user1.jpg'
      },
      hash: 'sha256-hash-1',
      downloadCount: 10,
      viewCount: 50,
      imageInfo: {
        width: 1920,
        height: 1080,
        format: 'jpeg',
        colorSpace: 'srgb',
        hasAlpha: false,
        orientation: 1
      },
      createdAt: new Date(),
      updatedAt: new Date()
    }

    return {
      code: HttpStatus.OK,
      message: '文件详情获取成功',
      data: file
    }
  }

  /**
   * 更新文件信息
   */
  @Put(':id')
  @ApiOperation({ summary: '更新文件信息' })
  @ApiResponse({
    status: HttpStatus.OK,
    description: '文件信息更新成功',
    type: ResponseDto<FileDto>
  })
  async updateFile(
    @Param('id', ParseUUIDPipe) id: string,
    @Body(ValidationPipe) updateFileDto: UpdateFileDto
  ): Promise<ResponseDto<FileDto>> {
    // const file = await this.fileService.updateFile(id, updateFileDto);
    const file: FileDto = {
      id,
      filename: updateFileDto.filename || 'updated-example.jpg',
      originalName: 'example.jpg',
      type: 'image' as any,
      mimeType: 'image/jpeg',
      size: 1024000,
      path: '/uploads/example.jpg',
      url: '/uploads/example.jpg',
      thumbnailUrl: '/uploads/thumbnails/example.jpg',
      status: 'completed' as any,
      access: updateFileDto.access || ('public' as any),
      description: updateFileDto.description,
      tags: updateFileDto.tags,
      category: updateFileDto.category,
      uploaderId: 'user-1',
      hash: 'sha256-hash-1',
      downloadCount: 10,
      viewCount: 50,
      createdAt: new Date(),
      updatedAt: new Date()
    }

    return {
      code: HttpStatus.OK,
      message: '文件信息更新成功',
      data: file
    }
  }

  /**
   * 删除文件
   */
  @Delete(':id')
  @ApiOperation({ summary: '删除文件' })
  @ApiResponse({
    status: HttpStatus.OK,
    description: '文件删除成功'
  })
  @Roles(UserRole.ADMIN, UserRole.SUPER_ADMIN, UserRole.EDITOR)
  async deleteFile(@Param('id', ParseUUIDPipe) id: string): Promise<ResponseDto<null>> {
    // await this.fileService.deleteFile(id);

    return {
      code: HttpStatus.OK,
      message: '文件删除成功',
      data: null
    }
  }

  /**
   * 批量操作文件
   */
  @Post('bulk')
  @ApiOperation({ summary: '批量操作文件' })
  @ApiResponse({
    status: HttpStatus.OK,
    description: '批量操作完成'
  })
  @Roles(UserRole.ADMIN, UserRole.SUPER_ADMIN, UserRole.EDITOR)
  async bulkFileOperation(
    @Body(ValidationPipe) bulkOperationDto: BulkFileOperationDto
  ): Promise<ResponseDto<{ affected: number }>> {
    // const result = await this.fileService.bulkOperation(bulkOperationDto);
    const result = { affected: bulkOperationDto.fileIds.length }

    return {
      code: HttpStatus.OK,
      message: `批量${bulkOperationDto.operation}操作完成`,
      data: result
    }
  }

  /**
   * 下载文件
   */
  @Get(':id/download')
  @ApiOperation({ summary: '下载文件' })
  @ApiResponse({
    status: HttpStatus.OK,
    description: '文件下载'
  })
  @Throttle({ default: { limit: 20, ttl: 60000 } }) // 每分钟最多下载20次
  async downloadFile(
    @Param('id', ParseUUIDPipe) id: string,
    @Query(ValidationPipe) downloadDto: FileDownloadDto,
    @Res({ passthrough: true }) res: Response
  ): Promise<StreamableFile> {
    // const { file, stream } = await this.fileService.downloadFile(id, downloadDto);
    const filename = downloadDto.filename || 'example.jpg'
    const buffer = Buffer.from('Mock file content', 'utf-8')

    res.set({
      'Content-Type': 'application/octet-stream',
      'Content-Disposition': downloadDto.forceDownload
        ? `attachment; filename="${filename}"`
        : `inline; filename="${filename}"`,
      'Content-Length': buffer.length.toString()
    })

    return new StreamableFile(buffer)
  }

  /**
   * 预览文件
   */
  @Get(':id/preview')
  @ApiOperation({ summary: '预览文件' })
  @ApiResponse({
    status: HttpStatus.OK,
    description: '文件预览'
  })
  @Throttle({ default: { limit: 50, ttl: 60000 } }) // 每分钟最多预览50次
  async previewFile(
    @Param('id', ParseUUIDPipe) id: string,
    @Res({ passthrough: true }) res: Response,
    @Query('size') size?: 'small' | 'medium' | 'large'
  ): Promise<StreamableFile> {
    // const { file, stream } = await this.fileService.previewFile(id, size);
    const buffer = Buffer.from('Mock preview content', 'utf-8')

    res.set({
      'Content-Type': 'image/jpeg',
      'Cache-Control': 'public, max-age=3600'
    })

    return new StreamableFile(buffer)
  }

  /**
   * 图片处理
   */
  @Post(':id/process')
  @ApiOperation({ summary: '图片处理' })
  @ApiResponse({
    status: HttpStatus.OK,
    description: '图片处理成功',
    type: ResponseDto<FileDto>
  })
  @Roles(UserRole.ADMIN, UserRole.SUPER_ADMIN, UserRole.EDITOR)
  async processImage(
    @Param('id', ParseUUIDPipe) id: string,
    @Body(ValidationPipe) processDto: ImageProcessDto
  ): Promise<ResponseDto<FileDto>> {
    // const processedFile = await this.imageService.processImage(id, processDto);
    const processedFile: FileDto = {
      id: 'processed-' + id,
      filename: 'processed-example.jpg',
      originalName: 'example.jpg',
      type: 'image' as any,
      mimeType: 'image/jpeg',
      size: 512000, // 处理后文件变小
      path: '/uploads/processed-example.jpg',
      url: '/uploads/processed-example.jpg',
      status: 'completed' as any,
      access: 'public' as any,
      uploaderId: 'user-1',
      hash: 'sha256-processed-hash',
      imageInfo: {
        width: processDto.width || 800,
        height: processDto.height || 600,
        format: processDto.format || 'jpeg',
        colorSpace: 'srgb',
        hasAlpha: false,
        orientation: 1
      },
      createdAt: new Date(),
      updatedAt: new Date()
    }

    return {
      code: HttpStatus.OK,
      message: '图片处理成功',
      data: processedFile
    }
  }

  /**
   * 获取文件统计信息
   */
  @Get('stats/overview')
  @ApiOperation({ summary: '获取文件统计信息' })
  @ApiResponse({
    status: HttpStatus.OK,
    description: '文件统计信息获取成功',
    type: ResponseDto<FileStatsDto>
  })
  @Roles(UserRole.ADMIN, UserRole.SUPER_ADMIN)
  // @UseInterceptors(CacheInterceptor)
  // @CacheTTL(300) // 5分钟缓存
  async getFileStats(): Promise<ResponseDto<FileStatsDto>> {
    // const stats = await this.fileService.getStats();
    const stats: FileStatsDto = {
      totalFiles: 10000,
      totalSize: 5368709120, // 5GB
      byType: {
        image: { count: 7000, size: 3221225472, percentage: 70 },
        video: { count: 500, size: 1073741824, percentage: 5 },
        audio: { count: 300, size: 536870912, percentage: 3 },
        document: { count: 2000, size: 536870912, percentage: 20 },
        archive: { count: 150, size: 268435456, percentage: 1.5 },
        other: { count: 50, size: 134217728, percentage: 0.5 }
      },
      byStatus: {
        uploading: 5,
        processing: 10,
        completed: 9980,
        failed: 3,
        deleted: 2
      },
      byAccess: {
        public: 8000,
        private: 1500,
        protected: 400,
        internal: 100
      },
      byMonth: [
        { month: '2024-01', count: 1000, size: 536870912 },
        { month: '2024-02', count: 1200, size: 644245094 },
        { month: '2024-03', count: 800, size: 429496730 }
      ],
      popularTypes: [
        { type: 'JPEG', count: 5000, percentage: 50 },
        { type: 'PNG', count: 2000, percentage: 20 },
        { type: 'PDF', count: 1500, percentage: 15 }
      ],
      largestFiles: [
        { id: 'file-1', filename: 'large-video.mp4', size: 104857600, type: 'video' as any },
        { id: 'file-2', filename: 'presentation.pptx', size: 52428800, type: 'document' as any }
      ],
      recentUploads: [
        { id: 'file-3', filename: 'recent.jpg', uploadedAt: new Date(), uploader: 'user1' },
        { id: 'file-4', filename: 'document.pdf', uploadedAt: new Date(), uploader: 'user2' }
      ],
      storageUsage: {
        used: 5368709120,
        limit: 10737418240, // 10GB
        percentage: 50,
        remaining: 5368709120
      }
    }

    return {
      code: HttpStatus.OK,
      message: '文件统计信息获取成功',
      data: stats
    }
  }

  /**
   * 分享文件
   */
  @Post(':id/share')
  @ApiOperation({ summary: '分享文件' })
  @ApiResponse({
    status: HttpStatus.OK,
    description: '文件分享成功',
    type: ResponseDto<FileShareResponseDto>
  })
  async shareFile(
    @Param('id', ParseUUIDPipe) id: string,
    @Body(ValidationPipe) shareDto: FileShareDto
  ): Promise<ResponseDto<FileShareResponseDto>> {
    // const shareInfo = await this.fileService.shareFile(id, shareDto);
    const shareInfo: FileShareResponseDto = {
      shareId: 'share-' + Date.now(),
      shareUrl: `https://example.com/shared/${id}?token=abc123`,
      qrCodeUrl: shareDto.shareType === 'qrcode' ? `https://example.com/qr/share-${Date.now()}.png` : undefined,
      expiresAt: shareDto.expiresAt ? new Date(shareDto.expiresAt) : new Date(Date.now() + 7 * 24 * 60 * 60 * 1000),
      createdAt: new Date(),
      accessCount: 0,
      downloadCount: 0,
      maxDownloads: shareDto.maxDownloads,
      requiresPassword: !!shareDto.password
    }

    return {
      code: HttpStatus.OK,
      message: '文件分享成功',
      data: shareInfo
    }
  }

  /**
   * 获取文件夹列表
   */
  @Get('folders')
  @ApiOperation({ summary: '获取文件夹列表' })
  @ApiResponse({
    status: HttpStatus.OK,
    description: '文件夹列表获取成功',
    type: ResponseDto<FolderDto[]>
  })
  @ApiQuery({ name: 'parentId', required: false, description: '父文件夹ID' })
  // @UseInterceptors(CacheInterceptor)
  // @CacheTTL(120) // 2分钟缓存
  async getFolders(@Query('parentId') parentId?: string): Promise<ResponseDto<FolderDto[]>> {
    // const folders = await this.folderService.getFolders(parentId);
    const folders: FolderDto[] = [
      {
        id: 'folder-1',
        name: '图片文件夹',
        path: '/images',
        parentId: parentId || null,
        description: '存放图片文件',
        access: 'public' as any,
        creatorId: 'user-1',
        creator: {
          id: 'user-1',
          username: 'admin',
          nickname: '管理员'
        },
        fileCount: 150,
        folderCount: 3,
        totalSize: 1073741824, // 1GB
        isSystem: false,
        sort: 0,
        createdAt: new Date(),
        updatedAt: new Date()
      }
    ]

    return {
      code: HttpStatus.OK,
      message: '文件夹列表获取成功',
      data: folders
    }
  }

  /**
   * 创建文件夹
   */
  @Post('folders')
  @ApiOperation({ summary: '创建文件夹' })
  @ApiResponse({
    status: HttpStatus.CREATED,
    description: '文件夹创建成功',
    type: ResponseDto<FolderDto>
  })
  @HttpCode(HttpStatus.CREATED)
  async createFolder(
    @Body(ValidationPipe) createFolderDto: CreateFolderDto,
    @CurrentUser() user: any
  ): Promise<ResponseDto<FolderDto>> {
    // const folder = await this.folderService.createFolder(createFolderDto, user.id);
    const folder: FolderDto = {
      id: 'folder-' + Date.now(),
      name: createFolderDto.name,
      path: createFolderDto.parentId ? `/parent/${createFolderDto.name}` : `/${createFolderDto.name}`,
      parentId: createFolderDto.parentId,
      description: createFolderDto.description,
      access: createFolderDto.access || ('public' as any),
      creatorId: user.id,
      creator: {
        id: user.id,
        username: user.username,
        nickname: user.nickname
      },
      fileCount: 0,
      folderCount: 0,
      totalSize: 0,
      isSystem: false,
      sort: createFolderDto.sort || 0,
      createdAt: new Date(),
      updatedAt: new Date()
    }

    return {
      code: HttpStatus.CREATED,
      message: '文件夹创建成功',
      data: folder
    }
  }

  /**
   * 更新文件夹
   */
  @Put('folders/:id')
  @ApiOperation({ summary: '更新文件夹' })
  @ApiResponse({
    status: HttpStatus.OK,
    description: '文件夹更新成功',
    type: ResponseDto<FolderDto>
  })
  async updateFolder(
    @Param('id', ParseUUIDPipe) id: string,
    @Body(ValidationPipe) updateFolderDto: UpdateFolderDto
  ): Promise<ResponseDto<FolderDto>> {
    // const folder = await this.folderService.updateFolder(id, updateFolderDto);
    const folder: FolderDto = {
      id,
      name: updateFolderDto.name || '更新的文件夹',
      path: '/updated-folder',
      parentId: updateFolderDto.parentId,
      description: updateFolderDto.description,
      access: updateFolderDto.access || ('public' as any),
      creatorId: 'user-1',
      creator: {
        id: 'user-1',
        username: 'admin',
        nickname: '管理员'
      },
      fileCount: 0,
      folderCount: 0,
      totalSize: 0,
      isSystem: false,
      sort: updateFolderDto.sort || 0,
      createdAt: new Date(),
      updatedAt: new Date()
    }

    return {
      code: HttpStatus.OK,
      message: '文件夹更新成功',
      data: folder
    }
  }

  /**
   * 删除文件夹
   */
  @Delete('folders/:id')
  @ApiOperation({ summary: '删除文件夹' })
  @ApiResponse({
    status: HttpStatus.OK,
    description: '文件夹删除成功'
  })
  @Roles(UserRole.ADMIN, UserRole.SUPER_ADMIN, UserRole.EDITOR)
  async deleteFolder(
    @Param('id', ParseUUIDPipe) id: string,
    @Query('force') force: boolean = false
  ): Promise<ResponseDto<null>> {
    // await this.folderService.deleteFolder(id, force);

    return {
      code: HttpStatus.OK,
      message: '文件夹删除成功',
      data: null
    }
  }

  /**
   * 获取文件类型
   */
  private getFileType(mimeType: string): any {
    if (mimeType.startsWith('image/')) return 'image'
    if (mimeType.startsWith('video/')) return 'video'
    if (mimeType.startsWith('audio/')) return 'audio'
    if (mimeType.includes('pdf') || mimeType.includes('document') || mimeType.includes('text')) return 'document'
    if (mimeType.includes('zip') || mimeType.includes('rar') || mimeType.includes('tar')) return 'archive'
    return 'other'
  }
}
